Sprinkler base



FIG. 1 is a perspective view of a sprinkler base;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front side view thereof;

FIG. 5 is a rear side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrate environmental structure only and form nopart of the claimed design.

CLAIM The ornamental design for a sprinkler base, as shown anddescribed.